s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 212

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

OSCILLATOR CIRCUITS
CLOCK OUTPUT PROCEDURE
The procedure for outputting clock pulses to the CLO1 or CLO2 pins may be summarized as follows:
1. Disable clock output by clearing CLMOD1.3 to logic zero.
2. Set the clock output frequency (CLMOD1.1, CLMOD1.0).
3. Load a "0" to the output latch of the CLO1 or CLO2 pins (P2.2 or P2.3).
4. Set the P2.2 or P2.3 mode flag (PM2.2 or PM2.3) to output mode.
5. Select % duty for CLO1 or CLO2 output clock.
6. Enable CLO1 or CLO2 for clock output (Both CLO1 and CLO2 also).
7. Enable clock output by setting CLMOD1.3 to logic one.
F
To output the CPU clock to the CLO1 pin:
6-12
PROGRAMMING TIP — CPU Clock Output to the CLO1 Pin
BITS
SMB
LD
LD
BITR
LD
LD
LD
LD
EMB
15
EA,#40H
PMG1,EA
P2.2
A,#2H
CLMOD2,A
A,#9H
CLMOD1,A
; P2.2
; Clear P2.2 output latch
S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
Output mode